Re: [PATCH 03/21] drm/kms-helpers: Extract drm_modeset_helper.[hc]

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On Fri, Aug 12, 2016 at 4:48 PM, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> While reviewing docs I spotted that we have a few functions that
> really just don't fit into their containing helper library section.
> Extract them and shovel them all into a new library for random one-off
> aux stuff.
>
> v2: Remove wrongly added files for real.
>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>

Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>

> ---
>  Documentation/gpu/drm-kms-helpers.rst |   9 ++
>  drivers/gpu/drm/Makefile              |   2 +-
>  drivers/gpu/drm/drm_crtc_helper.c     |  56 -------------
>  drivers/gpu/drm/drm_modeset_helper.c  | 153 ++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_plane_helper.c    |  66 ---------------
>  include/drm/drm_atomic_helper.h       |   2 +
>  include/drm/drm_crtc_helper.h         |   6 +-
>  include/drm/drm_modeset_helper.h      |  36 ++++++++
>  include/drm/drm_plane_helper.h        |   4 +-
>  9 files changed, 203 insertions(+), 131 deletions(-)
>  create mode 100644 drivers/gpu/drm/drm_modeset_helper.c
>  create mode 100644 include/drm/drm_modeset_helper.h
>
> diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
> index 34f755bc9133..59fa3c11efab 100644
> --- a/Documentation/gpu/drm-kms-helpers.rst
> +++ b/Documentation/gpu/drm-kms-helpers.rst
> @@ -258,3 +258,12 @@ Tile group
>
>  .. kernel-doc:: drivers/gpu/drm/drm_crtc.c
>     :doc: Tile group
> +
> +Auxiliary Modeset Helpers
> +=========================
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
> +   :doc: aux kms helpers
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
> +   :export:
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 0238bf8bc8c3..a5824d926dc9 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -24,7 +24,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
>  drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
>                 drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
>                 drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
> -               drm_simple_kms_helper.o drm_blend.o
> +               drm_simple_kms_helper.o drm_blend.o drm_modeset_helper.o
>
>  drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
>  drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index 604d3ef72ffa..5d2cb138eba6 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -75,35 +75,6 @@
>   */
>
>  /**
> - * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
> - *                                             connector list
> - * @dev: drm device to operate on
> - *
> - * Some userspace presumes that the first connected connector is the main
> - * display, where it's supposed to display e.g. the login screen. For
> - * laptops, this should be the main panel. Use this function to sort all
> - * (eDP/LVDS) panels to the front of the connector list, instead of
> - * painstakingly trying to initialize them in the right order.
> - */
> -void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
> -{
> -       struct drm_connector *connector, *tmp;
> -       struct list_head panel_list;
> -
> -       INIT_LIST_HEAD(&panel_list);
> -
> -       list_for_each_entry_safe(connector, tmp,
> -                                &dev->mode_config.connector_list, head) {
> -               if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
> -                   connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> -                       list_move_tail(&connector->head, &panel_list);
> -       }
> -
> -       list_splice(&panel_list, &dev->mode_config.connector_list);
> -}
> -EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
> -
> -/**
>   * drm_helper_encoder_in_use - check if a given encoder is in use
>   * @encoder: encoder to check
>   *
> @@ -913,33 +884,6 @@ int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
>  EXPORT_SYMBOL(drm_helper_connector_dpms);
>
>  /**
> - * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
> - * @fb: drm_framebuffer object to fill out
> - * @mode_cmd: metadata from the userspace fb creation request
> - *
> - * This helper can be used in a drivers fb_create callback to pre-fill the fb's
> - * metadata fields.
> - */
> -void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
> -                                   const struct drm_mode_fb_cmd2 *mode_cmd)
> -{
> -       int i;
> -
> -       fb->width = mode_cmd->width;
> -       fb->height = mode_cmd->height;
> -       for (i = 0; i < 4; i++) {
> -               fb->pitches[i] = mode_cmd->pitches[i];
> -               fb->offsets[i] = mode_cmd->offsets[i];
> -               fb->modifier[i] = mode_cmd->modifier[i];
> -       }
> -       drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
> -                                   &fb->bits_per_pixel);
> -       fb->pixel_format = mode_cmd->pixel_format;
> -       fb->flags = mode_cmd->flags;
> -}
> -EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
> -
> -/**
>   * drm_helper_resume_force_mode - force-restore mode setting configuration
>   * @dev: drm_device which should be restored
>   *
> diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c
> new file mode 100644
> index 000000000000..1d45738f8f98
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_modeset_helper.c
> @@ -0,0 +1,153 @@
> +/*
> + * Copyright (c) 2016 Intel Corporation
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and its
> + * documentation for any purpose is hereby granted without fee, provided that
> + * the above copyright notice appear in all copies and that both that copyright
> + * notice and this permission notice appear in supporting documentation, and
> + * that the name of the copyright holders not be used in advertising or
> + * publicity pertaining to distribution of the software without specific,
> + * written prior permission.  The copyright holders make no representations
> + * about the suitability of this software for any purpose.  It is provided "as
> + * is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
> + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
> + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
> + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
> + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
> + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
> + * OF THIS SOFTWARE.
> + */
> +
> +#include <drm/drm_modeset_helper.h>
> +#include <drm/drm_plane_helper.h>
> +
> +/**
> + * DOC: aux kms helpers
> + *
> + * This helper library contains various one-off functions which don't really fit
> + * anywhere else in the DRM modeset helper library.
> + */
> +
> +/**
> + * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
> + *                                             connector list
> + * @dev: drm device to operate on
> + *
> + * Some userspace presumes that the first connected connector is the main
> + * display, where it's supposed to display e.g. the login screen. For
> + * laptops, this should be the main panel. Use this function to sort all
> + * (eDP/LVDS) panels to the front of the connector list, instead of
> + * painstakingly trying to initialize them in the right order.
> + */
> +void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
> +{
> +       struct drm_connector *connector, *tmp;
> +       struct list_head panel_list;
> +
> +       INIT_LIST_HEAD(&panel_list);
> +
> +       list_for_each_entry_safe(connector, tmp,
> +                                &dev->mode_config.connector_list, head) {
> +               if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
> +                   connector->connector_type == DRM_MODE_CONNECTOR_eDP)
> +                       list_move_tail(&connector->head, &panel_list);
> +       }
> +
> +       list_splice(&panel_list, &dev->mode_config.connector_list);
> +}
> +EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
> +
> +/**
> + * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
> + * @fb: drm_framebuffer object to fill out
> + * @mode_cmd: metadata from the userspace fb creation request
> + *
> + * This helper can be used in a drivers fb_create callback to pre-fill the fb's
> + * metadata fields.
> + */
> +void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
> +                                   const struct drm_mode_fb_cmd2 *mode_cmd)
> +{
> +       int i;
> +
> +       fb->width = mode_cmd->width;
> +       fb->height = mode_cmd->height;
> +       for (i = 0; i < 4; i++) {
> +               fb->pitches[i] = mode_cmd->pitches[i];
> +               fb->offsets[i] = mode_cmd->offsets[i];
> +               fb->modifier[i] = mode_cmd->modifier[i];
> +       }
> +       drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
> +                                   &fb->bits_per_pixel);
> +       fb->pixel_format = mode_cmd->pixel_format;
> +       fb->flags = mode_cmd->flags;
> +}
> +EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
> +
> +/*
> + * This is the minimal list of formats that seem to be safe for modeset use
> + * with all current DRM drivers.  Most hardware can actually support more
> + * formats than this and drivers may specify a more accurate list when
> + * creating the primary plane.  However drivers that still call
> + * drm_plane_init() will use this minimal format list as the default.
> + */
> +static const uint32_t safe_modeset_formats[] = {
> +       DRM_FORMAT_XRGB8888,
> +       DRM_FORMAT_ARGB8888,
> +};
> +
> +static struct drm_plane *create_primary_plane(struct drm_device *dev)
> +{
> +       struct drm_plane *primary;
> +       int ret;
> +
> +       primary = kzalloc(sizeof(*primary), GFP_KERNEL);
> +       if (primary == NULL) {
> +               DRM_DEBUG_KMS("Failed to allocate primary plane\n");
> +               return NULL;
> +       }
> +
> +       /*
> +        * Remove the format_default field from drm_plane when dropping
> +        * this helper.
> +        */
> +       primary->format_default = true;
> +
> +       /* possible_crtc's will be filled in later by crtc_init */
> +       ret = drm_universal_plane_init(dev, primary, 0,
> +                                      &drm_primary_helper_funcs,
> +                                      safe_modeset_formats,
> +                                      ARRAY_SIZE(safe_modeset_formats),
> +                                      DRM_PLANE_TYPE_PRIMARY, NULL);
> +       if (ret) {
> +               kfree(primary);
> +               primary = NULL;
> +       }
> +
> +       return primary;
> +}
> +
> +/**
> + * drm_crtc_init - Legacy CRTC initialization function
> + * @dev: DRM device
> + * @crtc: CRTC object to init
> + * @funcs: callbacks for the new CRTC
> + *
> + * Initialize a CRTC object with a default helper-provided primary plane and no
> + * cursor plane.
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> +                 const struct drm_crtc_funcs *funcs)
> +{
> +       struct drm_plane *primary;
> +
> +       primary = create_primary_plane(dev);
> +       return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
> +                                        NULL);
> +}
> +EXPORT_SYMBOL(drm_crtc_init);
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index b522aabd1ab0..50b9c1bfc6f6 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -64,18 +64,6 @@
>   */
>
>  /*
> - * This is the minimal list of formats that seem to be safe for modeset use
> - * with all current DRM drivers.  Most hardware can actually support more
> - * formats than this and drivers may specify a more accurate list when
> - * creating the primary plane.  However drivers that still call
> - * drm_plane_init() will use this minimal format list as the default.
> - */
> -static const uint32_t safe_modeset_formats[] = {
> -       DRM_FORMAT_XRGB8888,
> -       DRM_FORMAT_ARGB8888,
> -};
> -
> -/*
>   * Returns the connectors currently associated with a CRTC.  This function
>   * should be called twice:  once with a NULL connector list to retrieve
>   * the list size, and once with the properly allocated list to be filled in.
> @@ -438,60 +426,6 @@ const struct drm_plane_funcs drm_primary_helper_funcs = {
>  };
>  EXPORT_SYMBOL(drm_primary_helper_funcs);
>
> -static struct drm_plane *create_primary_plane(struct drm_device *dev)
> -{
> -       struct drm_plane *primary;
> -       int ret;
> -
> -       primary = kzalloc(sizeof(*primary), GFP_KERNEL);
> -       if (primary == NULL) {
> -               DRM_DEBUG_KMS("Failed to allocate primary plane\n");
> -               return NULL;
> -       }
> -
> -       /*
> -        * Remove the format_default field from drm_plane when dropping
> -        * this helper.
> -        */
> -       primary->format_default = true;
> -
> -       /* possible_crtc's will be filled in later by crtc_init */
> -       ret = drm_universal_plane_init(dev, primary, 0,
> -                                      &drm_primary_helper_funcs,
> -                                      safe_modeset_formats,
> -                                      ARRAY_SIZE(safe_modeset_formats),
> -                                      DRM_PLANE_TYPE_PRIMARY, NULL);
> -       if (ret) {
> -               kfree(primary);
> -               primary = NULL;
> -       }
> -
> -       return primary;
> -}
> -
> -/**
> - * drm_crtc_init - Legacy CRTC initialization function
> - * @dev: DRM device
> - * @crtc: CRTC object to init
> - * @funcs: callbacks for the new CRTC
> - *
> - * Initialize a CRTC object with a default helper-provided primary plane and no
> - * cursor plane.
> - *
> - * Returns:
> - * Zero on success, error code on failure.
> - */
> -int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> -                 const struct drm_crtc_funcs *funcs)
> -{
> -       struct drm_plane *primary;
> -
> -       primary = create_primary_plane(dev);
> -       return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
> -                                        NULL);
> -}
> -EXPORT_SYMBOL(drm_crtc_init);
> -
>  int drm_plane_helper_commit(struct drm_plane *plane,
>                             struct drm_plane_state *plane_state,
>                             struct drm_framebuffer *old_fb)
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index d86ae5dcd7b4..5a02e499f32b 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -29,6 +29,8 @@
>  #define DRM_ATOMIC_HELPER_H_
>
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_modeset_helper.h>
>
>  struct drm_atomic_state;
>
> diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
> index 4b37afa2b73b..982c299e435a 100644
> --- a/include/drm/drm_crtc_helper.h
> +++ b/include/drm/drm_crtc_helper.h
> @@ -41,6 +41,7 @@
>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_modeset_helper.h>
>
>  extern void drm_helper_disable_unused_functions(struct drm_device *dev);
>  extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
> @@ -53,11 +54,6 @@ extern bool drm_helper_encoder_in_use(struct drm_encoder *encoder);
>
>  extern int drm_helper_connector_dpms(struct drm_connector *connector, int mode);
>
> -extern void drm_helper_move_panel_connectors_to_head(struct drm_device *);
> -
> -extern void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
> -                                          const struct drm_mode_fb_cmd2 *mode_cmd);
> -
>  extern void drm_helper_resume_force_mode(struct drm_device *dev);
>
>  int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
> diff --git a/include/drm/drm_modeset_helper.h b/include/drm/drm_modeset_helper.h
> new file mode 100644
> index 000000000000..b8051d5abe10
> --- /dev/null
> +++ b/include/drm/drm_modeset_helper.h
> @@ -0,0 +1,36 @@
> +/*
> + * Copyright (c) 2016 Intel Corporation
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and its
> + * documentation for any purpose is hereby granted without fee, provided that
> + * the above copyright notice appear in all copies and that both that copyright
> + * notice and this permission notice appear in supporting documentation, and
> + * that the name of the copyright holders not be used in advertising or
> + * publicity pertaining to distribution of the software without specific,
> + * written prior permission.  The copyright holders make no representations
> + * about the suitability of this software for any purpose.  It is provided "as
> + * is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
> + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
> + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
> + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
> + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
> + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
> + * OF THIS SOFTWARE.
> + */
> +
> +#ifndef __DRM_KMS_HELPER_H__
> +#define __DRM_KMS_HELPER_H__
> +
> +#include <drm/drmP.h>
> +
> +void drm_helper_move_panel_connectors_to_head(struct drm_device *);
> +
> +void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
> +                                   const struct drm_mode_fb_cmd2 *mode_cmd);
> +
> +int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> +                 const struct drm_crtc_funcs *funcs);
> +
> +#endif
> diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
> index fbc8ecb3e5e8..c18959685c06 100644
> --- a/include/drm/drm_plane_helper.h
> +++ b/include/drm/drm_plane_helper.h
> @@ -27,6 +27,7 @@
>  #include <drm/drm_rect.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_modeset_helper.h>
>
>  /*
>   * Drivers that don't allow primary plane scaling may pass this macro in place
> @@ -37,9 +38,6 @@
>   */
>  #define DRM_PLANE_HELPER_NO_SCALING (1<<16)
>
> -int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> -                 const struct drm_crtc_funcs *funcs);
> -
>  int drm_plane_helper_check_state(struct drm_plane_state *state,
>                                  const struct drm_rect *clip,
>                                  int min_scale, int max_scale,
> --
> 2.8.1
>
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